I need more info

I don't get it ... You just give the numbers for the USA sales but some of the computer companies are international..Why don't you include the worldwide rankings also? Is it possible that the Mac has lost it's worldwide ranking? Lots of computers being sold in China...I have been using multiple highend Macs and PCs for video and graphics with high end hardware (HD) for years and I just don't get the Mac "Experience"... Don't get me wrong..it's a good system but it has it's own issues just like Vista. But I feel I have an advantage with cross platform that a single platform user does not have. K